Method of making torch tips



Occ. 4, 1927.

E. H. SMITH METHOD oF MAKING TORCH TIPS Filed NO'V. 15. 1926 ///////////////////////////////L//zv fl/,

HG 7 ,1 Veit/oz? /.MER HJM/TH Patented oct. 4, 1927.

UNITED STATES ELMER E. SMITH, OF MINNEAPOLIS, MINNESOTA.

METHOD OF MAKING TORCH TIPS.

Application led November 15, 1926. `Serial'No. 148,560.

In the manu facture of a one piece Oxy-fuel tip used in welding torches and like devices,

it has been customary to take a solid block of p metal, preferably copper, and eiongated in form, and bore the same longitudinally to provide a series of comparatively small ducts spaced a art around a central bore, for leading the ow pressure oxygen and fuel as to a point where it will be burned 1n close proximity to the central duct. The tip conveniencel in reaching the work, and for the purpose of locating the frame of the torch at a point remote from the other parts to prevent damage thereto by over heating. In drilling it often happens that after some of the holes have been drilled, a vdrill will break when attempting to form another bore or opening. It is impractical to remove the broken part of the drill and thus the partly completed tip must be thrown aside, all the previous work thereon being wasted. The boring operation', in other respects than this, is expensive, and it has been found practically impossible to bore a long opening o small caliber in a straight line. Moreover if the openings are to converge inwardly toward the axis of the base adjacent the outer end of the tip, a straight bore must first be made from one end, and then a bore made from the opposite end to meet the first bore at an angle, and form a continuation. It is practically impossible to have the bores meety in the proper manner.

It is, therefore, an object of this invention to provide a method of forming the openings in such a tip which will eliminate the use of small drills and the drilling of long openings, and the present method provides means for forming non-linear passages of smaller uniform or non-uniform caliber, and of different cross-sectional configuration without the drilling or boring. The method further provides means whereby the openings may be furnished or made smooth and whereby the caliber may be made uniform.- The features of the invention include the use of wires as cores introduced in openings formed in a solid piece; the swaging to reduce the diameter of the piece thus prepared, while the wires are in place, and to at the same time elongate or spread lengthwise the metal to-form a tip of t e desired length.

In the accompanying drawings, forming a part of this specification:

is made comparatively long forv and 2. I then bore openings 2 wit Figure 1 is a longitudinal section showing the block bored and with the wires in' lace. Figure 2 is an end view of Figure 1.

Flgure 3 shows the swaging operation tion.

, vFigure -4 is a view similar to Fi ure 3 showlng one end of the tip taperedg.

Figure 5 is a diagrammatic view of ,the

swa-gmg operation.

Figure 6 corresponds to Figure 4, but shows the wires removed.

Figure 7 is a section view of the completed tip.

In carrying out the invention, I select a piece of copper stock, for a certain size tip, for example a block 1 approximatel an inch in diameter and an inch long, see lili res 1 comparatively large drills longitudinally of the block, that is parallel to its cylindrical axis, with the openings arran ed in accordance with the design of the wor in hand. I then f introduce wires 3 into the openings, the wire at present in use being ordinary piano wire. The wires used as cores to prevent closing in of meta-lat those points at which it is desired to produce the finished, elongated bores, of small caliber. The diameter of the wires therefore corresponds, to the caliber of the openings desired inthe finished tip.

complete, the view being a sectional elevav The next step is a swaging operation which reduces the diameter of the block and elongates the same, the diameter then being approximately nine-sixteenths of an inch and the length about three inches. This operationis, however, continued until the desired length and diameter is obtained.

The next step is to withdraw the wires and in order to release the same, I heat the piece which acts to release the wire from its opening, to permit its withdrawal. A smooth bore is the result', having uniform diameter of from one thirty-second to one sixty-fourth of an inch. It is practically impossible to produce openings of this size uniformly by drilling, without breaking a drill. Moreover the process is a speedy one and very cheap. y

When it is desired to have those openings surrounding and lying outside of the central openin s, converge toward the axis of the piece a jacent the outer end of the tip, I then taper. that end of the tip by swaging wvhile the Wires are in place. The result is shown in F igures 4 and 6. A swaglng device is conventionally illustrated in Figure 5. .The finished tip is shown in Figure 7.

I claim as my invention:

l. Method for producing torch tips which consists in boring a solid section of, a ductile having a series of fine openings lengthwise therethrough, which consists in boring a.

piece of block copper, placing a core wire in each bore and swaging to lengthen the piece, then heating the piece, and withdrawing the wires.

4. A method of 'roducing torch tips having a series of ne openings lengthwise therethrough, which consists of boring a series of parallel openings through a plece of block copper, placing a core wire in each bore and swaging the metal about the wires to lengthen and reduce the diameter of the piece.

5. A method of producing torch tips havtherethrough, which consists of boring a series of parallel openings through a piece of block copper, placing a core wue in each bore and swaging the metal about the wires to lengthen and reduce, the diameter of the piece, and then heatin the piece and withdrawing the wires, while heating.

6. A method for producing one piece torch tips which consists in taking a section of copper having a series of openings therein, disposing wires within the openings, then swaging to reduce the diameter of the section and lengthen the same, about the wires.

7. A method of producing torch tips having a series of line openings lengthwise therethrough which consists of boring a series of parallel openings through a piece of block copper placing a core wire of less diameter than the bore, in each bore, and swaging the metal about the wires to lengthen and reduce the diameter of the piece.

In witness whereof, l have hereunto set my hand this 10th day of November 1926.

ELMER H. SMITH.

- ing a series of fine openings lengthwise 

